st.async GPU Virtual ISA NVIDIA

st.async Data Movement and Conversion Instructions

st.async{.weak}{.ss}.completion_mechanism{.vec}.type [a], b, [mbar];

st.async is a non-blocking instruction which initiates an asynchronous store operation that stores the value specified by source operand b to the destination memory location specified by operand a.

Encoding

PTX is a virtual instruction set. It has no single, stable native binary encoding - the compiler lowers this instruction to different native machine code depending on the selected NVIDIA target architecture (compute capability). This page intentionally shows no bit-diagram; see the target/version requirements below for what governs how this instruction compiles.
PTX ISA Version Introduced PTX ISA 8.1
Minimum Target sm_90

Syntax Forms

One mnemonic covers many type / state-space / scope / modifier combinations - each row below is an independently valid form.

Syntax Data Types State Space(s) Modifiers Min. Target Description
st.async{.weak}{.ss}.completion_mechanism{.vec}.type [a], b, [mbar]; sm_90 st.async is a non-blocking instruction which initiates an asynchronous store operation that stores the value specified by source operand b to the destination memory location specified by operand a. (see the official PTX ISA docs for the full description)

Operands

At a Glance

Data Types -

Related

More in Data Movement and Conversion Instructions

Reference

NVIDIA PTX ISA

Description

st.async is a non-blocking instruction which initiates an asynchronous store operation that stores the value specified by source operand b to the destination memory location specified by operand a. st.async is performed in the generic proxy.

Examples

st.async.shared::cluster.mbarrier::complete_tx::bytes.u32 [addr], b, [mbar_addr];

st.async.sys.release.global.u32 [addr], b;

st.async.mbarrier::complete_tx::bytes.b128 [addr], b, [mbar_addr];
// (truncated - see the official PTX ISA docs for the full example)

Reproduced from NVIDIA's official PTX ISA documentation for technical accuracy.

Sources